Hello!
I want to setup BIRD to anounce BGP routes for my AS. We have two backbone providers so I'll need to make two BGP connections. I only need to anounce routes and don't want to import them. I also want on the second BGP conection to prepend our AS several times, so this route should be less prefered.
I have worked out a draft bird configuratioan, but some things are unclear to me.
## bird.conf ## protocol bgp one { local as 65333; # our AS (let say it is) neighbor peer.one.ip as [theiras]; # peer one and their AS multihop 20 via my.next.hop.ip; # not directly connected import none; export ; # this part is not clear to me # I want to export my whole a.b.c.d/19 # network. What do I put here. source address x.y.z.w; # The IP address of my router }
First of all, you need to have the route in your routing table to have it exported. Usually, it's a good idea to define a sink route for your whole address block, so that packets to non-existent destinations in your block are not sent back and forth between your router and your provider's router. Hence: protocol static { route 1.2.0.0/19 reject; } Then you can tell the bgp's to export just this route: protocol bgp one { ... export where net = 1.2.0.0/19; }
protocol bgp one { local as 65333; # our AS (let say it is) neighbor peer.two.ip as [theiras]; # peer two and their AS multihop 20 via my.next.hop.ip; # not directly connected import none; export ; # Same thing as above, but prepend our AS # several times, so this route is less # prefered
Here you can use the following filter: export { if net != 1.2.0.0 then reject; bgp_path.prepend(1234); bgp_path.prepend(1234); bgp_path.prepend(1234); accept; }; Have a nice fortnight -- Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/ Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth Diplomacy is an art of saying "nice doggy" until you can find a rock.